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Interesting dynograph posted by APR here showing their Stage II software on a 3.0 TFSI B8 S4 versus a competitors Stage I software. The competitor is not named but APR was asked to retune the car and got just under 20 more horsepower at all four wheels out of it to bring it to just over 400 at the wheels on a dynojet in DIN correction. The graph gets choppy at the end where the S-Tronic transmission decided to upshift.

So what accounts for the gain? APR states the unnamed competitor is not able to tune for the upgraded pulley whereas with their Stage II software they are. It's a bit unfair to not name the competitor so that they may have a chance at a rebuttal so this is a bit one-sided. Regardless, great gains by APR and awesome power out of the S4 on pump gas with their software.

I'm in accrington Lancashire do you know anyone else who has had them fitted and if so where they happy as they are not cheap and would hate to get them and there is no difference

Here you go:

From SuperSprint:

Originally Posted by SuperSprint

- 767731 (pipes that removes the OEM cats) and 767702+767732 front pipe with metallic cats
List price is € 3.202
This setup has not showed dramatically improved performance on an S4 fitted with a MTM remap.
A bit more torque in the mid range but not higher max power.